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Find the 18th terms of the A.P. 7, 13,19...

Find the 18th terms of the A.P. 7, 13,19, 25

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The correct Answer is:
The 18th term of the given A.P. Is 109
Here, `a= 7,d= 13-7= 6 , t_(18) = ?`
`t_(n) = a+ ( n -1) d ` …( Formula )
` :. T_(18) = 7+ ( 18-1) xx 6` …( Substituting the values )
` = 7 + 17 xx 6`
`= 7 + 102 `
`:. t_(18) = 109`
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